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‎partt3/Makefile

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kernel_source_files := $(shell find src/impl/kernel -name *.c)
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kernel_object_files := $(patsubst src/impl/kernel/%.c, build/kernel/%.o, $(kernel_source_files))
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x86_64_c_source_files := $(shell find src/impl/x86_64 -name *.c)
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x86_64_c_object_files := $(patsubst src/impl/x86_64/%.c, build/x86_64/%.o, $(x86_64_c_source_files))
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x86_64_asm_source_files := $(shell find src/impl/x86_64 -name *.asm)
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x86_64_asm_object_files := $(patsubst src/impl/x86_64/%.asm, build/x86_64/%.o, $(x86_64_asm_source_files))
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x86_64_object_files := $(x86_64_c_object_files) $(x86_64_asm_object_files)
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$(kernel_object_files): build/kernel/%.o : src/impl/kernel/%.c
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mkdir -p $(dir $@) && \
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x86_64-elf-gcc -c -I src/intf -ffreestanding $(patsubst build/kernel/%.o, src/impl/kernel/%.c, $@) -o $@
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$(x86_64_c_object_files): build/x86_64/%.o : src/impl/x86_64/%.c
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mkdir -p $(dir $@) && \
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x86_64-elf-gcc -c -I src/intf -ffreestanding $(patsubst build/x86_64/%.o, src/impl/x86_64/%.c, $@) -o $@
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$(x86_64_asm_object_files): build/x86_64/%.o : src/impl/x86_64/%.asm
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mkdir -p $(dir $@) && \
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nasm -f elf64 $(patsubst build/x86_64/%.o, src/impl/x86_64/%.asm, $@) -o $@
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.PHONY: build
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build: $(kernel_object_files) $(x86_64_object_files)
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sudo mkinitramfs -o targets/x86_64/iso/boot/grub/initrd.img
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mkdir -p dist/x86_64 && \
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x86_64-elf-ld -n -o dist/x86_64/kernel.bin -T targets/x86_64/linker.ld $(kernel_object_files) $(x86_64_object_files) && \
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cp dist/x86_64/kernel.bin targets/x86_64/iso/boot/kernel.bin && \
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dd if=/dev/zero of=dist/x86_64/kernel.iso bs=1M count=50
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sudo mkfs.fat -F32 dist/x86_64/kernel.iso
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sudo fatlabel dist/x86_64/kernel.iso 9BAR-DEF0
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grub-mkrescue /usr/lib/grub/i386-pc -o dist/x86_64/kernel.iso targets/x86_64/iso
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clean:
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rm -rf build
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rm -rf dist
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cd targets/x86_64/iso/boot/grub/
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rm -f initrd.img

‎partt3/Readme.md

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#Os dev part 1
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initrd: sudo mkinitramfs -o targets/x86_64/iso/boot/grub/initrd.img

‎partt3/run.sh

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make clean && make && make build
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qemu-system-x86_64 dist/x86_64/kernel.iso

‎partt3/src/impl/kernel/main.c

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#include "print.h"
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/*#include <stdarg.h>
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#include <stddef.h>*/
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#include "types.h"
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void kernel_main() {
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int x = 6;
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int y = 3;
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int o = x * y;
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print_clear();
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print_set_color(PRINT_COLOR_YELLOW, PRINT_COLOR_LIGHT_GREEN);
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print_str("Welcome to our 64-bit kernel!\n");
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print_str("This is the FAT FILE SYSTEM\n");
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// print_str(name);
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//printf("this is a %c\n", name);
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//print_int(ma);
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printf("output %d", o);
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}

‎partt3/src/impl/x86_64/boot/header.asm

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section .multiboot_header
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header_start:
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; magic number
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dd 0xe85250d6 ; multiboot2
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; architecture
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dd 0 ; protected mode i386
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; header length
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dd header_end - header_start
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; checksum
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dd 0x100000000 - (0xe85250d6 + 0 + (header_end - header_start))
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; end tag
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dw 0
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dw 0
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dd 8
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header_end:

‎partt3/src/impl/x86_64/boot/main.asm

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global start
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extern long_mode_start
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section .text
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bits 32
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start:
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mov esp, stack_top
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call check_multiboot
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call check_cpuid
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call check_long_mode
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call setup_page_tables
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call enable_paging
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lgdt [gdt64.pointer]
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jmp gdt64.code_segment:long_mode_start
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hlt
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check_multiboot:
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cmp eax, 0x36d76289
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jne .no_multiboot
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ret
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.no_multiboot:
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mov al, "M"
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jmp error
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check_cpuid:
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pushfd
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pop eax
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mov ecx, eax
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xor eax, 1 << 21
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push eax
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popfd
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pushfd
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pop eax
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push ecx
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popfd
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cmp eax, ecx
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je .no_cpuid
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ret
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.no_cpuid:
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mov al, "C"
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jmp error
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check_long_mode:
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000001
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jb .no_long_mode
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mov eax, 0x80000001
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cpuid
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test edx, 1 << 29
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jz .no_long_mode
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ret
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.no_long_mode:
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mov al, "L"
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jmp error
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setup_page_tables:
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mov eax, page_table_l3
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or eax, 0b11 ; present, writable
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mov [page_table_l4], eax
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mov eax, page_table_l2
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or eax, 0b11 ; present, writable
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mov [page_table_l3], eax
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mov ecx, 0 ; counter
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.loop:
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mov eax, 0x200000 ; 2MiB
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mul ecx
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or eax, 0b10000011 ; present, writable, huge page
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mov [page_table_l2 + ecx * 8], eax
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inc ecx ; increment counter
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cmp ecx, 512 ; checks if the whole table is mapped
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jne .loop ; if not, continue
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ret
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enable_paging:
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; pass page table location to cpu
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mov eax, page_table_l4
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mov cr3, eax
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; enable PAE
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mov eax, cr4
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or eax, 1 << 5
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mov cr4, eax
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; enable long mode
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mov ecx, 0xC0000080
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rdmsr
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or eax, 1 << 8
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wrmsr
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; enable paging
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mov eax, cr0
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or eax, 1 << 31
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mov cr0, eax
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ret
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error:
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; print "ERR: X" where X is the error code
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mov dword [0xb8000], 0x4f524f45
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mov dword [0xb8004], 0x4f3a4f52
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mov dword [0xb8008], 0x4f204f20
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mov byte [0xb800a], al
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hlt
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section .bss
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align 4096
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page_table_l4:
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resb 4096
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page_table_l3:
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resb 4096
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page_table_l2:
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resb 4096
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stack_bottom:
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resb 4096 * 4
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stack_top:
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section .rodata
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gdt64:
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dq 0 ; zero entry
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.code_segment: equ $ - gdt64
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dq (1 << 43) | (1 << 44) | (1 << 47) | (1 << 53) ; code segment
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.pointer:
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dw $ - gdt64 - 1 ; length
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dq gdt64 ; address

‎partt3/src/impl/x86_64/boot/main64.asm

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global long_mode_start
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extern kernel_main
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section .text
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bits 64
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long_mode_start:
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; load null into all data segment registers
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mov ax, 0
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mov ss, ax
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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call kernel_main
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hlt

‎partt3/src/impl/x86_64/ports.c

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#include <stdint.h>
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// Read a byte from the specified port
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static inline uint8_t inportb(uint16_t port) {
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uint8_t result;
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__asm__ volatile ("inb %1, %0" : "=a"(result) : "dN"(port)); // we don't care asm code AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAaaaaaaaaa
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return result;
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}
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// Write a byte to the specified port
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static inline void outportb(uint16_t port, uint8_t data) {
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__asm__ volatile ("outb %0, %1" : : "a"(data), "dN"(port));
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}

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